Expanding arbor



E. HOTTINGER. ExPANmNG Anson.

APPLICATION FILED JUNE 30,4919.

Sz fizvenor:

l" joizer, 3y is dii?? UNITED srArss PATE-NT] OFFICE,

EMIL HOTTINGER, or PHILADELPHIA, PENNSYLVANIA," AssIGNoR To Huss-,BRIGHT MANUFACTURING COMPANY, or IrIILADELrHIA, PENNSYLVANIA, A CORPORA- TION OF Y DELAWARE.

' Application Ied June 30,

To aU whom it may concern:

Be it known that I, EMIL 'HoTTINGnm a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, 'have invented certain new and useful Improvements in Expanding Arbors, of which the following is a specification. f

This invention relates to arbors for supporting annular pices'of work, particularly those which are to be machined or finished in some manner upon the outer surfaces, an object of the invention being to form such an arbor with a closed chamber and locate an expander therein in such manner that thev working parts are completely housed within such closed chamber. Since thesel arbors are frequently used 1n positions Vwhere the work carried by them fis subjected to a cooling bath, it is quite necessary to protect the working parts. In other instances where the work is performed in a practically dry condition, such working rparts should be protected from chips and abrasives which otherwise interfere with the proper working of the parts and prove destructive to the device asa whole. f

The drawings acompanying rthis specilication illustrate the invention, in which drawingsy Figure 1 is a view partly in central longitudinal section and partly in elevation of my improved arbor, showing the same in its work clamping or holding position.

Fig. 2 is a cross section taken on a plane at about line 2-2 of Fig. 1, and a Fig. 3 is a cross section through the shell and the expander plug at about the lines 'f3-m and -y respectively, illustrating the manner of assembling these parts.

My improved arbor in the form illustrated, is intended to be mounted between centers and to be driven by a live spindle of "some suitable machine, as for instance a grinding machine. The centers may if desired engage permanent 9parts of the arbor casing sockets 19, 20', being shown for such purpose.

Y The shell 5 of the arbor is formed with a hollow interior 6, and a substantial cylindricalv external work receiving face 7; This face preferably has a slight taper, from the stop shoulder'S to the outer end. Dotted lines show a piece of work 9`in positio'non EXPANDING Amana,y

Specication of Letters Patent.

u Patented July 20,1920; 191e. saranno'. 307,594. A

ticity of theV metal of the shell when re-V lieved from such expanding force. A pre- A fe'rred mode of construction of this wall for affording this ability to expand and contract is the formation of a series of longi-r tudinal'external depressions. 10 defining a plurality of outwardly extending ribs 11, and longitudinal internal depressions 12,*

.defining a plurality of inwardly extending ribs'13,'the wall at the bottom of each ofv the external grooves being formed as an inwardly'facing rib. It is upon the outer faces of the ribs'll that the cylindrical.

work received seat 7 is formed. Upon thev innernface of the ribs 13, expander and engaging faces Mare provided, these latter faces being formed on a taper for the engagement 'of the taper face 15 of the expander plug 16. The exterior of the plug is `shown provided with a series of longitudinal grooves 17, defining a plurality of ribs 18, upon the crests vof which is formed the taper face 15.

The front endlof the shell is shown proi vided with an integral closed end 19. A re-v movable closure 20 is carried by the back end of the shell. A V,completely closed chamber is thus provided within the, shell in which the expander is inclosedand its ends are preferably normally freefrom the ends of the shell. From the foregoing it will be seen that within the chamber of the elarstically exp'ansible arbor there are inclosed means active upon the walls of said arbor for expanding the same,such means being responsive to the impact of a blow upon thel end of the arbor. In fact the expanderA means, the taper plug in the present illustration, is

moved toward either end of the arbor by theY impact of a blow or succession that end of the arbor. Y v

When it is .desired to apply a piece offworlr to thearbor, as for instance a ring 9, the

of blows' upon arbor is preferably placed in an upright po-l'r.

sition, for instance with the back end, repre- Y seat.

sented yby closure 20, resting upon a work bench,the ring is then slipped over the outer or front end of the arbor until it rests against the back stop shoulder 8, whereupon the arbor is raised a short distanceffrom Vthe work bench and either perinittod to drop or or cibly brought in .contact with sonic object, whereupon the expander plug moves inwardly and toward the end 20 thereby ex* panding the shell and consequently expanding the work seat 7. This movement also draws the work against the back stop. Vhen it is desiredto remove the work a reverse operation is performed, namely the arbor is again put in a vertical position, but this time with the Yfront end, represented by the closure 19, directed downwardly, and a blow imparted to such end,'as for instance by permitting the arbor to fall upon theV work bench or other solid body as for instance a block of wood. It is the better practice to use some elastic striking body so that too vheavy a blow will not be given or the end of the arbor injured. The blow on the end 19, particularly when this is in an upright position, brings the expander from its active to itsv idle position, permits the wall of the shell, by the influence of its own elasticity to assume its' normal position, and at the same time causes the work to drop fromthe lwork It is then merely necessary for the workman to reverse the position of the arbor upon the bench and place another ring in position and again perform the expanding operation.

' In the form of the invention illustrated in the drawing it will be seen that the larger end of .the expander plug isin the permanently closed end of the'shell, that is vthe taper upon the crests of the ribs 13 and 18, namely the faces 14 and 15, taper from such closed end backwardly toward the end having the removable closureQO. Y

To enable the ready assemblage of the parts, in other words the insertion ofsuch a plug into such a chamber, the grooves 12 are of suliicient dimensions at the back or open end of the shell to receive and permit the passage of the ribs 18, and the grooves 17 are also of suliicient dimensions to Vreceive and let pass the ribs 13. This is illustrated in Fig. 3 which shows'the parts at about the commencement of the insertion, the cross' section of the shell being taken at about the plane of the line 3 9@ and the cross'section w of` the plug being taken at about the plane of the line B-y/ of such ligure. Upon the coinpletion of the insertion of the plug the .crests of the ribs 18', assume a position in which they are of less radius than are the crests of the ribs 13, at any particular point, whereupon aV slight rotation of theplug relatively tothe shell of an angular distance ofrhalf.

- the pitch distance will bring the parts from the angular position representedV in Fig. 3

formed to mate with the grooves 12.

rlhe spring 22 is suiiciently strong to pre-V vent displacement of the detents, 4but the en-- gaging parts are so formed that the application of a slight amount of force will readily depress the detents and permit the disassemblage when desired. f

1t will be apparent that changes maybemade in the details of constructionv for lthe purpose of adapting my improved arbor toy the various uses to which it will be put without departing from ythe spirit ot my invention as set'forth in the claims.

` I claim as my invention: i

1. .The combination with an elastically ex-` pansible arbor provided upon its exterior with a work seat, there being .al chamber vwithin. said arbor, oii an expander located wholly in said chamber and capable upon its movement to expand the same `and adapted Vto be moved by the impact oi a blow upon the end of thearbor. l v

2. An expanding arbor, comprising a shell `having,elastic side walls, provided on the exterior with a work seat, the walls of the shell forming a closed chamber, and a weighted expander plug located in the chamber and adapted to act upon the elastic side walls `for expanding the same and the work seat.

8. An expanding arbor, comprisingan elastically expansible shell and a reciprocatory expander located wholly within the shell and adapted upon its excursion to act upon the shell for expanding the sa-me, the parts being so organized that the impact of a blow upon one end of the arbor effects the excursion of the expander and the impact of a blow on' the other vend of the arbor effects the recession of the expander.

4. An expanding arbor, comprising an` elastically expansible shell and a reciprocatory expander loca-ted wholly within the shell, the parts being so organized that the impact of a blow upon either .end oli-the f arbor moves the expander toward such end.

5.Y Thecombination with an arbor havin-g an elastically expansible wall provided upon its exteriory with a work seat, of a reciproca.

tory expander located wholly within such izo wall, the parts being so` shaped and organ- Y ized that impact ap ied to one end of the arbor causes the expander toA expand the wall at the work seat and impact: applied to the opposite end causes the expander to re. lease such wall to the influence of its elasticity.

own

6. Anjexpa-nding-arbor', 'comprising a shell having upon its exterior a work seat, its interior forming a closed chamber, of a reciprocatory expanderv inclosed within such chamber, the parts being so shaped and organized that impact applied to one end of the arbor seats the work and expands the work seat and impact applied to the opposite end contracts the work seat and unseats the work.-

7. An expanding arbor, comprising a shell having upon Vits exterior a work seat and a work stop at the back of the seat, the seat tapering from such Vstop toward the front, the wall of such shell forming a closed chamber tapering from the front end toward the back end, and a vsimilarly tapering expander plug inclosed in said chamber and normally free of the ends thereof, the parts being so organized that the imp-act of a blow on the back end seats the work and expands the work seat and a blow upon the front end of the arbor permits the walls to contract and unseats the work.

8. An expanding arbor, comprising a shell having upon its exterior a work seat and a work stop at the back of the seat, the seat tapering from such stop toward the front, the wall of such shell forming a closed chamber tapering from the front end toward the back end, a similarly tapering expander plug inclosed in said chamber and normally free of the ends thereof, the parts being so organized that the impact of a blow on the back end seats the work and draws the expander toward the back end, thereby expanding the wall and the work seat, and a blow upon the front end of the arbor withv draws the expander toward the front end and permits the walls to contract and unseats the work.

9. An arbor having an expansible wall provided with an exterior work receiving face, there being a chamber within such wall, the wall being unbroken throughout 'for closing such chamber, and a heavy taper expander plug freely-reciprocatory within suoli chamber and adapted to move forward by its momentum and act upon the arbor wall for expanding the same upon arrest of momentum of the arbor.

l0. An arbor having an expansible wall provided with an exterior work receiving face, there being a chamber within such wall, the wall being unbroken throughout lfor closing such chamber, and a heavy taper expander plug freely reciprocatory within such chamber and adapted to move toward either end of the arbor responsive to a blow upon such end.

1l. An expansible arbor, comprising a shell having a substantially cylindrical exterior surface provided with longitudinal ribs and grooves, the inside being provided with ribs opposite the bottoms of the exterior grooves and with grooves opposite the interior ribs, thereby forming an unbroken elastically expansible wall, the crests of the interior ribs being tapered, and a tapered expandingmember located within the shell andadapted to engage the crests of the interior ribs forexpanding the wall.

l2. An expansible arbor, comprising a shell having. asubstantially cylindrical exterior surface provided with longitudinal ribs and grooves, the inside being provided with ribs opposite the bottoms of the exterior grooves and with grooves opposite the interior ribs, thereby forming an unbroken elastically expansible wall, the crests of the interior Vribs being tapered and a tapered expanding member located within the shell and provided with ribs adapted to engage the crests of the interior ribs for expanding the wall.

13. An expansible arbor, comprising a shell having a substantially cylindrical exterior surface provided with longitudinal ribs and grooves, the inside being provided with ribs opposite the bottoms othe exterior grooves and with grooves opposite the interior ribs, thereby forming an unbroken elastically expansible wall, the crests of the interior ribs being tapered, a tapered expanding memberr located within the shell and provided with ribs adapted `to engage the crests of the interior ribs for expanding the wall and means for preventing rotation of the shell and expander..

14. .An expanding arbor, comprising a shell adapted to expand responsive to internal pressure and to elastically assume its normal position upon release from saidl pressure, such shell having closed ends affording a closed chamber, and an expander member inclosed within said chamber and longitudinally movable therein and operative shell having tapered vribs to engage the inte rior ribs of the shell for expanding the work seat. f

16. An expanding arbor, comprising a` shell having longitudinal ribs upon its ex-V terior, the crests of said ribs forming a'work seat and longitudinal ribs and. grooves upon its interior, the crests of such ribs being tapered, the chamber of the shell being per-V manently closed at the larger end defined by said taper, and an expander inclosed within such chamber, the surface of such expander being provided with a series of longitudinal ribs and grooves, the ribs of the expander being located in position to engage the ribs of the shell `for expanding the same, and said ribs and grooves oi' the expander and the shell being respectively located in suoli relativepositions that a slight rotation ol the expander brings its ribs between the ribs of the shell whereby the larger end of the expander may be inserted into or Withdra-Wn from' the chamber at the smaller end thereof.

17.v An expanding arbor as delined in claim 1G having a closure for the smaller end or" the chamber. Y 18. An expanding arbor, as defined in claim 16 having` a closure for the smaller end of the chamber, and spring pressed detents carried by the expander and adapted tQ enter `the `grooves'in the shell' for holding the expander in its operative position.

19. An expanding arbor, comprising aV shell having upon its exterior a Work seat 20 pering sides, and a similarly tapering reei-prooatory expander plug inelosed .in said chalnber. Y Y

In testimony whereof I have hereunto set my hand this 20th dayof June, 1919.

y EMIL HOTTINGER. f 

